Crank-movement for well-drills.



No. 755,083; PATENTED MAR. 22, 1904. w. R. VANDEWERKBR.

CRANK MOVEMENT-FOR WELL DRILLS.

. APPLIOATION FILED MAR. 25. 1903.

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. ii f i I el lflorgz ys UNITE STATES WARREN R. VANDEVVERKER,

Patented March 22, 1904.

OF CLARK, SOUTH DAKOTA.

- CRANK-MOVEMENT FOR W ELL-DRILLS.

SPECIFICATION forming part of Letters Patent No. '7 55,083, dated March 2 2, 1904.

Application filed March 25, 1903.

To all whom, it may concern:

Be it known that I, WARREN R. VANDEWER- KER, a citizen of the United States, residing at Clark, in the county of Clark and State of South Dakota, have invented anew and useful Crank- Movement for Well-Drills, of which the following is a specification;

This inventionrelates to devices for converting rotary into reciprocatory motion with differential speeds at different portions of the stroke, and has for its object to produce a simply-constructed device which may be employed for various purposes and by which a. rapid forward or downward movement may be imparted to a member of a machine, such as the drill-rod of a well-drilling machine, and a slow return or lifting movement; and the invention consists, primarily, in two shafts out of alinement longitudinally, one shaft having a radially-slotted arm and the other having a crank-arm with a crank-pin movably engaging the slotted arm.

Other novel features of the invention will appear in the annexed description and be specified in the claims following.

In the drawings illustrative of the inven' tion, in which corresponding parts are denoted stroke.

elevation on the line 2 2 of Fig. 1.

by like designating characters, Figure 1 is a front elevation. Fig. 2 is a sectional side Fig. 3 is a sectional detail illustrating the relative positions of the parts at the beginning of the up- Fig. 4 is a similar view showing. the parts arranged as at the beginning of the down or power stroke.

The device may be applied to a variety of purposes, but more particularly applicable to the operation of drill-rods, such as welldrills; but I do not wish to be limited inthe use of the device to any specific purpose and reserve the right to its use in any locality oi for any purpose for which it is adapted.

The improved device consists of two shafts 1O 11,- mounted for rotation in a suitable frame, as at 12, and out of alinement longitudinally.

Theshaft 10 is the main driving-shaft, adapted to be rotated by any suitable power, such as a band running over a wheel 13, and provided on its free end with an arm 14, having a radially-disposed groove or channel 15. The

Serial No. 149,538. (No model.)

shaft 11 is the driven shaft, and is provided with a crank-arm 16, having a crank-pin 17, carrying the drillrod-operatingbeam, (represented at 18,) andwith its outer'end extending into the groove or channel 15 in the arm 14, as shown. The crank-pin will preferably be provided with a block 19, slidable in the channel 15, as shown. The relative proportions of the parts will be'such that when'they are in the position shown in Fig. 3 the block 19 will be at the inner end of the channel 15 and when in the position shown in Fig. 4 the block will be at the outer end of the channel. By this simple arrangement when the shaft 10 p is rotated in the direction of the arrow, at the beginning of the upstroke of the crank-arm and its connected member 18, the leverage of the arm 14 upon the crank-pin will be very strong and the motion imparted correspondingly slow, as indicated in Fig. 3, and when the arm .14 passes over the upper center the block 19 will have been moved to the outer end of the channel, so that the leverage will have been correspondingly increased and the rapidity of the downstroke likewise correspondingly increased, as illustrated in Fig. 4:. Thus the lift upon the rod is strong where most needed'and the drop very rapid where rapidity is essential to produce the required forceful blow of the drill. The action is thus very eflicient and produced without jar or concussion, and consequently with relatively small wear upon the moving parts. The parts Having thus described the invention, what I claim is- 1. The combination of a driving and driven shaft whose axes produced are parallel, an arm projecting laterally from the driving-shaft and fixed thereon, a sliding member mounted on said arm, a crank projecting laterally from the driven shaft and fixed thereon, and a crankpin fixed on said crank at such a distance from the driven shaft that it describes a circle including the driving-shaft, said pin being journaled in the sliding member upon the arm carried by the driving-shaft.

2. The combination of a driving-shaft and a driven shaft Whose axes produced are parallel, an arm fixed to the driving-shaft and projecting laterally therefrom, said arm being provided with a longitudinal groove in the inner face thereof, a crank fixed to the driven shaft and having a crank-pin fixed in its free end and extending in a line parallel with said WARREN R. VANDEWERKER.

Witnesses:

R. J. MANN, S. H. ELRoD. 

